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探讨了不同施钾水平下水培番茄叶片光谱信息的变化规律,建立了基于水培番茄叶光谱信息施钾量的预测模型。研究表明:不同施钾水平下水培番茄叶片的光谱信息在整个测试范围(350~2 500 nm)内的变化规律比较复杂,在可见光波段469~743 nm和近红外波段743~1 392 nm、1 500~1 785 nm,高水平和低水平钾的叶片光谱反射率均低于正常养分的光谱反射率;在1 450 nm处,番茄叶片的光谱反射率随着施钾量的增加而增大。
The changes of spectral information of hydroponic tomato leaves under different potassium levels were discussed, and a prediction model based on spectral information of hydroponic tomato leaves was established. The results showed that the changes of spectral information of hydroponic tomato leaves under different K levels were complex in the whole test range (350 ~ 2 500 nm). The changes of spectral information in the range of 469 ~ 743 nm in visible light and 743 ~ 1 392 nm in near infrared From 500 to 1785 nm, the leaf spectral reflectance of high level and low level potassium was lower than that of normal nutrient. At 1 450 nm, the spectral reflectance of tomato leaves increased with the increase of potassium application.